Insect Brains

The insectan nervous system evolved from the segmented system of annelid worms, such as the earthworm. Each of the insect's segments has its own nerve center, called a ganglion, which is connected by a pair of nerves to the ganglia of the adjacent segments. The insect's head consists of a set of fused segments; if you look closely at the head capsule of a grasshopper you can see some of the sutures between the segments. Inside the head, the segmental ganglia have fused to form a brain. The major parts of an insect's brain are the:

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